Malicious PDF — malware analysis report

Static analysis result for SHA-256 33caf2dd1782c358…

MALICIOUS

PDF

59.6 KB Created: 2020-12-03 16:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c2af76ca38641188496d4a26699364e SHA-1: 1e8a06ed39e9b1ab2a925facf610856b5667c5e9 SHA-256: 33caf2dd1782c3587eb7c1ad7fc3b6b9ae50dad609fcd599bc7c96d0b5586667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point to the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/aws?utm_term=logic+pro+x+trap+template+free
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/3892c252b9.pdf
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/2092390.pdf
    • https://kutusavirub.weebly.com/uploads/1/3/4/2/134265758/lejizujife.pdf
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/roboze_xetizukizew_tafodefezi.pdf
    • https://nimediwajukijiz.weebly.com/uploads/1/3/4/5/134501673/3609333.pdf
    • https://xedexebil.weebly.com/uploads/1/3/4/2/134235570/dopofuwumisesa_nosijod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e925ea4a794d56451110/t/5fc41cbe9ee0f32b87d4f218/1606687936274/pedivaxafiwo.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfa9872f8b574a0f33879/1606220440708/51477375435.pdf
    • https://static1.squarespace.com/static/5fc0e2fd6b97992eb55c026f/t/5fc8b84946ef2e08cbbcca1b/1606989901502/car_alarm_siren_sound_effect.pdf
    • https://static1.squarespace.com/static/5fc51f70f7cf8c7540462545/t/5fc6f9f356cd4459b3ac6be1/1606875637760/earn_to_die_2012_part_2_poki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad8f.bin
79f8a7a53fbc349ace6a30f33d69ff5f8fa1579b0dcaf9ef539863875f98ac5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8F 5164 bytes
font_01_sfnt_off0000bf22.bin
f05f23086c7f1355d358e35cdfb2e85104afcc4af165a6e84334bdf9a447f609
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 10344 bytes